How Can I Achieve Compatibility Between ExtendPathMode and Kubernetes client-go?

Application Scenario

The Kubernetes pod structure does not contain ExtendPathMode. Therefore, when a user calls the API for creating a pod or deployment by using client-go, the created pod does not contain ExtendPathMode. CCE provides a solution to ensure compatibility with the Kubernetes client-go.

Solution

Notice

When creating a pod, you need to add kubernetes.io/extend-path-mode to annotation of the pod.
When creating a Deployment, you need to add kubernetes.io/extend-path-mode to kubernetes.io/extend-path-mode in the template.

The following is an example YAML of creating a pod. After the kubernetes.io/extend-path-mode keyword is added to annotation, the containername, name, and mountpath fields are matched, and the corresponding extendpathmode is added to volumeMount.

apiVersion: v1
kind: Pod
metadata:
  name: test-8b59d5884-96vdz
  generateName: test-8b59d5884-
  namespace: default
  selfLink: /api/v1/namespaces/default/pods/test-8b59d5884-96vdz
  labels:
    app: test
    pod-template-hash: 8b59d5884
  annotations:
    kubernetes.io/extend-path-mode: '[{"containername":"container-0","name":"vol-156738843032165499","mountpath":"/tmp","extendpathmode":"PodUID"}]'
    metrics.alpha.kubernetes.io/custom-endpoints: '[{"api":"","path":"","port":"","names":""}]'
  ownerReferences:
    - apiVersion: apps/v1
      kind: ReplicaSet
      name: test-8b59d5884
      uid: 2633020b-cd23-11e9-8f83-fa163e592534
      controller: true
      blockOwnerDeletion: true
spec:
  volumes:
    - name: vol-156738843032165499
      hostPath:
        path: /tmp
        type: ''
    - name: default-token-4s959
      secret:
        secretName: default-token-4s959
        defaultMode: 420
  containers:
    - name: container-0
      image: 'nginx:latest'
      env:
        - name: PAAS_APP_NAME
          value: test
        - name: PAAS_NAMESPACE
          value: default
        - name: PAAS_PROJECT_ID
          value: b6315dd3d0ff4be5b31a963256794989
      resources:
        limits:
          cpu: 250m
          memory: 512Mi
        requests:
          cpu: 250m
          memory: 512Mi
      volumeMounts:
        - name: vol-156738843032165499
          mountPath: /tmp
          extendPathMode: PodUID
        - name: default-token-4s959
          readOnly: true
          mountPath: /var/run/secrets/kubernetes.io/serviceaccount
      terminationMessagePath: /dev/termination-log
      terminationMessagePolicy: File
      imagePullPolicy: Always
  restartPolicy: Always
  terminationGracePeriodSeconds: 30
  dnsPolicy: ClusterFirst
  serviceAccountName: default
  serviceAccount: default
  nodeName: 192.168.0.24
  securityContext: {}
  imagePullSecrets:
    - name: default-secret
    - name: default-secret
  affinity: {}
  schedulerName: default-scheduler
  tolerations:
    - key: node.kubernetes.io/not-ready
      operator: Exists
      effect: NoExecute
      tolerationSeconds: 300
    - key: node.kubernetes.io/unreachable
      operator: Exists
      effect: NoExecute
      tolerationSeconds: 300
  priority: 0
  dnsConfig:
    options:
      - name: timeout
        value: ''
      - name: ndots
        value: '5'
      - name: single-request-reopen
  enableServiceLinks: true

Table 1 Descriptions of key parameters
Parameter	Type	Description
containername	String	Name of a container.
name	String	Name of a volume.
mountpath	String	Mount path.
extendpathmode	String	A third-level directory is added to the created volume directory/subdirectory to facilitate the obtaining of a single pod output file. The following types are supported. None: The extended path is not configured. PodUID: ID of a pod. PodName: Name of a pod. PodUID/ContainerName: ID of a pod or name of a container. PodName/ContainerName: Name of a pod or container.

Parent topic: Storage

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